ASTM A193 B7 Diameter:1/2"~3 3/4" Length:not be limited Surface finished: self color,black,zinc plated,hot dipped galvanised Greade:B7 Packing:Pallet or Bundle We specially manufacture the ASTM A193 B7 Thread Rod.TheThread is head treated by rolling .If you have this kind of need,please contact us by e-mail.We warmly welcome all the customers from abroad or home.